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F. ST. G. KIRKE.

GAS FIRED BOILER.

I APPLICATION FILED FEB. I3. 1919.

Patented Nov. 4, 1919.

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GAS FIRED BOILER.

APPLICATION FILED FEB. l3. I919.

' 1 1,056- Patented Nov. 4, 1919.

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curring therein.

rare.

PERCY ST. G. KIRKE, OF LONDON, ENGLAND.

earners.

Specification of Letters Patent.

GAS-FIRED BOILER.

Patented Nov. a, 191%.

Application filed February 13, 1919. Serial No. 276,817.

'vented certain new and useful Improve ments in Gas-Fired Boilers, of which the following is a specification.

. This invention relates to gas-fired boilers of the type in which combustion occurs within boiler tubes each supplied with gas by separate gas burners. In a known construction the burners of each row of tubes are fed with gas by a pipe common to all the burners of the row and branching from a gas header.

This arrangement calls for much adjustment of the valves because of the difficulty of supplying gas at the samepressure atv all points along several pipes; moreover it does not always allow a satisfactory view of the interior of the boiler tubes for'ascertaining whether the most eflicient combustion is oc- Even more important is the fact that the construction becomes impracticable when the length of the boiler tubes is much increased and the bore reduced because then the area through the branch pipes is insufficient to take to each burner the increased quantity of gas required for supplying the increased heating surface.

By my invention a number or group of burners is connectedwith one or more gas supply boxes, such box or boxes being placed in front of the boiler tube plate so that each burner is fed from the box and is opposite to or coaxial with its corresponding boiler tube. A hot air chamber may be arranged between the said box or boxes and the tube plate.

In' a drum of any given diameter and length greater heating surface can be obtained with tubes of small bore than with tubes of large bores, provided that in the former case the distance between the cen ters of the tubes is less than in the latter case. a

For a given amount of heating surface the smaller and longer the tubes, and the closer they are together, the cheaper the boiler is to build.

it Against thisyfor ag'iven 'outputof steam, the smaller'the tubes the greater the number required, and consequently the greater thenumber of burners'which have to be adjusted. Again, a long tube hasa greater. amount water and four inches of water,

of heating surface, burns more gas and consequently requires a larger burner.

Further, the lower the calorific value of the gas the larger is the burner required by each tube.

One object of the present invention is to obtain a multiple burner arrangement which, when once adjusted, can be satisfactorily controlled by one or two large valves. Another object of the invention is to enable a burner arrangement to be made for supplying a multi-tubular boiler having long separately fired tubes of comparatively small bore and considerable length, so that j the cost of the boiler shell per square foot of heatlng surface may be reduced. A third object of the invention is the provision of a group of burners which can be adjusted individually and also collectively.

I have found by experiment that when the initial pressure lies between one inch of the quantities of gas flowing through restricted orifices vary approximately according to the same law, although such orifices may be somewhat different 1n size and shape and pass different quantities of gas.

Again in practice, I have found it very diflicult to obtain boiler tubes of exactly the same bore owing-to the fact that the stay tubes are usually thicker than the ordinary tubes. I have also found it difficult to get exactly the same degree of suction down each boiler tube. For these reasons in prac tice a multi-tubular boiler having a burner for each tube will consume varying amounts of gas in the different tubes when running efliciently, and it is consequently necessary to provide some adjustment for regulating" the quantity of gas burnt ineach tube. This adjustment of gas to the separate tubes having once been made when the boiler is started up subsequent regulation of load can be obtained by controlling the pressure of the gasat each burner and the suction on the boiler.

. By the present invention, control of pressure to a number of burners is obtainable by operating only one valve, because, although the tube centers are fixed, dimension X, Fig. 2 may be increased sufliciently to insure the pressure at all the burners being the same even when large volumes of gas have to be supplied to a great number of burners placed close together, there being no wirev to be different from the pressure of another valve. Moreover, by making the valve spindles, if any, hollow, it is possible to see how the combustion is proceeding in each tube. Primary air may be drawn through the hollow spindle and elsewhere if desired.

Lighting up may be facilitated by having pilot gas jets on the top of each burner, so that when the valve is turned on the gas is automatically lighted.

In the accompanying drawings Figure 1 is a front elevation of a single gas supply box having burners arranged according to the invention and mounted in front of the tube plate of a boiler. Fig. '2 is a section on line 22 of Fig. 1.

In the front and back of the box a are coaxial openings 6 disposed in vertical and horizontal rows, and the box is fixed in a position such that these openings are coaxial with the corresponding boiler tubes 0 (Fig. 2 The box is supplied with gas through a valve-controlled port (Z.

The burner tube, fitted to each opening on the back side of the box, is made in two parts, a front portion 6 mounted with slight lateral play on a rear portion 7 which is fixed to the box. The portion 0 .carries a projecting piece 9 adapted to rest on the inner surface of the end of the boiler tube 0. Owing to this construction the coaxial relationship between the boiler tube and the burner tube is maintained notwithstanding slight relative eccentricity between any valve h and its boiler tube 0. The box or gas receptacle (1 is of such dimensions and shape that the velocity of gas flowing to each burner is such that the gas pressure will be substantially the same at each burner. To this end, the width of said box or receptacle may be greater than the distance between the centers of the gas burners or jets.

The valve h adapted to close the burner tube is fixed to the tubular spindle 2' which extends through a guide plug and stufiing box in the opening in the front of the box a. This end of the spindle being screwthreaded a hand-wheel having a corresponding nut serves for opening and closing the valve.

The tubular spindle being coaxial with the boiler tube a view of the interior of the latter can always be obtained through the spindle, which may be closed by glass or other transparent substance if desired, if primary air is not wanted. As air drawn in through the tubular spindle tends to cause flame to strike-back in the burner tube, the spindle is preferably extended some distance into the burner tube, as indicated in Fig. 2, to avoid this tendency. Pilot jets supplied by pipes a may be employed to light the main burners.

The box a has a cleaning door Z and a drain m for deposited tarry matter.

Having thus described the nature of the said invention and the best means I know of carrying the same into practical efiect, I claim 1. The combination with a multitubular boiler, of a gas burner therefor comprising a gas receptacle and a number of jets issuing from the side of the receptacle adjacent to the boiler tubes, there being one of said jets discharging into each of the tubes of said boiler, and said jets being separately adjustable and collectively controllable.

2. The combination with a multitubular boiler, of a gas burner therefor comprising a gas receptacle the pressure of which is controllable and a number of gas jets each of which is adjustable issuing from the side of said receptacle adjacent to the boiler tubes, there being one of said jets discharging into each of the tubes of said boiler.

3. The combination with a multitubular boiler, of a gas burner therefor comprising a gas receptacle, meansfor controlling the admission of gas to said receptacle, a miniber of gas jets issuing from the side of said receptacle adjacent to the boiler tubes, there being one of said jets discharging into each of the tubes of said boiler, and means for independently adjusting said jets.

4. The combination with a multitubular boiler having tubes arranged in vertical and horizontal rows, of a gas burner for said boiler comprising a gas receptacle the pressure of which is controllable and a number of gas jets each of which is adjustable issuing from the side of said receptacle adjacent to the boiler tubes, said jets corresponding in number and arrangement to said tubes.

5. The combination with a multi-tubular boiler having combustion tubes arranged in several rows, of a gas burner for said boiler comprising a gas receptacle, the pressure of which is controllable, and a number of 7 gas jets each of which is adjustable issuing from the side of the said receptacle adjacent to the boiler tubes, said jets corresponding in number and arrangement to said tubes.

6. A gas burner for boilers comprising a gas receptacle provided with cleaning doors for removing deposit and a drain for removing tar, a number of gas jets issuing from said receptacle, a valve for controlling the admission of gas to said receptacle, a number of valves for controlling said jets, respectively, each of said valves being fitted with a hollow spindle, and a pilot for lighting each of said jets.

7. The combination with a multitubular boiler, of a gas burner therefor comprising a gas receptacle and a number of gas jets issuing from the side of said receptacle adjacent to the boiler tubes, there being one of said jets discharging into, each of the tubes of said boiler, said jets being separately adjustable and collectively controllable, and said receptacle being of such dimensions and shape that the velocity of gas flowing to each burner is such that the pressure is substantially the same at each burner.

8. A gas burner for boilers comprising a gas receptacle provided with cleaning doors for removing deposit and a drain for removing tar, a number of gas jets or burners issuing from said receptacle, said receptacle being of such dimensions and'shape that the velocity of gas flowing to each burner is such that the pressure is substantially the same at each burner, a valve for controlling the admission of gas to said receptacle, a number of valves for controlling said jets, respectively each of said valves being fitted with a hollow spindle, and a pilot for lighting each of said jets.

9. A gas burner for boilers comprising a gas receptacle and a number of gas jets or burners issuing from said receptacle and each comprising a nozzle mounted at the gas supply end with slight lateral play, the

other end being supported in a suitable man-' ner by a tube of the boiler.

10. A gas burner for boilers comprising a gas receptacle provided with cleaning doors for removing deposit and a drain for removing tar, a number of gas jets or burners issuing from said receptacle and each comprising a nozzle mounted at the gas supply end with slight lateral play, the other end being supported in a suitable manner by a tube of the boiler, said receptacle being of such dimensions and shape that the velocity of gas flowing to each burner is such that the pressure is substantially the same at each burner, a valve for controlling the admission of gas to said receptacle, a number of valves for controlling said jets, respectively, each of said valves being fitted with a hollow spindle, and a pilot for lighting each of said jets.

In testimony whereof I have name to this specification.

PERCY ST. G. KIRKE.

signed my Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. 0. 

